Well, at the risk of Grayve getting mad at me again, we did learn that there were Allagan survivors in the Fourth Umbral Era, and the Sons would know about them if you completed that questline. However, this seems to imply the existence of an already well-documented Allagan civilization that arose after the Calamity and Umbral Era that were assumed to have eradicated them. Furthermore, it implies that they also moved towards a more technology-based society just like they had in the previous Astral Era.

So... what gives? Is there a second Allagan Empire that arose after the first? An Allagan Republic? Or is this simply the Age of the Sultana all over again?